code: def belongs_test_data(self):
      data = [
          dict(
              point=gs.array([[1.0, 0.0], [-1.0, 3.0]]), expected=True
          ),
          dict(
              point=gs.array([[1.0, -1.0], [-1.0, 3.0]]), expected=False
          ),
          dict(
              point=gs.array([[-1.0, 0.0], [-1.0, 3.0]]), expected=False
          ),
          dict(
              point=gs.array(
                  [
                      [[1.0, 0], [0, 1.0]],
                      [[1.0, 2.0], [2.0, 1.0]],
                      [[-1.0, 0.0], [1.0, 1.0]],
                      [[0.0, 0.0], [1.0, 1.0]],
                  ]
              ),
              expected=gs.array([True, False, False, False]),
          ),
          dict(
              point=gs.array(
                  [
                      [
                          [1.0, 0.0, 1.0],
                          [0.0, 1.0, 0.0],
                          [0.0, 0.0, 1.0],
                      ],
                      [
                          [0.0, 0.0, 0.0],
                          [2.0, 1.0, 0.0],
                          [0.0, 0.0, 1.0],
                      ],
                      [
                          [1.0, 0.0, 0.0],
                          [2.0, 1.0, 0.0],
                          [0.0, 0.0, 1.0],
                      ],
                      [
                          [-1.0, 0.0, 0.0],
                          [2.0, 1.0, 0.0],
                          [0.0, 0.0, 1.0],
                      ],
                  ]
              ),
              expected=gs.array([False, False, False, False]),
          ),
      ]
      return self.generate_tests(data)
  
imports: import math
  import geomstats.backend
  from geomstats.test.data import TestData
  from .base import VectorSpaceOpenSetTestData
  from .invariant_metric import InvariantMetricMatrixTestData
  from .lie_group import MatrixLieGroupTestData
  from .pullback_metric import PullbackDiffeoMetricTestData
  from .riemannian_metric import RiemannianMetricTestData
label_desc: Use image node_id 1 for calling the PositiveLowerTriangularMatrices2TestData obj's underlying member method code with example usage: obj.belongs_test_data() and returns: self